The Swede contested a single Formula 1 Grand Prix, his home event in 1974, at the wheel of a Shadow DN3 where he retired with transmission failure. Sadly for Roos, he failed to gel with the team management and his services were dispensed with in favour of Tom Pryce.

Born in Gothenburg, Roos was a graduate of the Opert driving school before going on to win the 1973 US Super Vee championship, later going on to achieve success in European Formula 2 and Canadian Formula Atlantic.

All his all-too-brief association with Formula 1, he returned to Atlantic racing in Canada and the United States. He now runs a racing school.